Joseph R Thomasson Site 9a (Neogene of the United States)

Also known as JRT Site 9a

Where: Ellis County, Kansas (39.0° N, 99.5° W: paleocoordinates 39.3° N, 97.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ogallala Formation, Hemphillian (10.3 - 4.9 Ma)

• stratotype locality of the Prolithospermum johnstonii-Nassella pohlii zone

Environment/lithology: pond; diatomaceous marl

• "a lacustrine element, such as a pond"
• "diatomaceous marl"

Size class: macrofossils

Collected by M. K. Darnell, J. R. Thomasson in 2001

Collection methods: surface (in situ),

• specimens are in the Fort Hays State Museum collection

Primary reference: M. K. Darnell and J. R. Thomasson. 2007. First equid remains from the late Miocene Prolithospermum johnstonii-Nassella pohlii assemblage zone stratotype locality, Ellis County, Kansas. Transactions of the Kansas Academy of Science 110(1-2):10-15 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 79633: authorized by John Alroy, entered by John Alroy on 16.03.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• plant list repeated from Thomasson 1979; gar scales are also present lower in the local section
Show authors, comments, and common names
unclassified
  -
Nassella pohlii, Nassella reynoldsii, Cryptantha auriculata, Prolappula verrucosa
Nassella pohlii
"grass anthoecia"
Nassella reynoldsii
"grass anthoecia"
Cryptantha auriculata
"borage nutlets"
Prolappula verrucosa
"borage nutlets"
Angiospermae
 Poales - Poaceae
Berriochloa amphoralis, Berriochloa maxima, Berriochloa minuta, Berriochloa pumila, Berriochloa tuberculata, Berriochloa variegata, Panicum elegans
Berriochloa amphoralis grass
"grass anthoecia"
Berriochloa maxima grass
"grass anthoecia"
Berriochloa minuta grass
"grass anthoecia"
Berriochloa pumila grass
"grass anthoecia"
Berriochloa tuberculata grass
"grass anthoecia"
Berriochloa variegata grass
"grass anthoecia"
Panicum elegans panicgrass
"grass anthoecia"
 Boraginales - Boraginaceae
Biorbia fossilia, Prolithospermum johnstonii
Biorbia fossilia borage
"borage nutlets"
Prolithospermum johnstonii borage
"borage nutlets"
 Rosales - Ulmaceae
Celtis willistonii
Celtis willistonii hackberry
"endocarps"
Mammalia
 Perissodactyla - Equidae
Neohipparion eurystyle
Neohipparion eurystyle Cope 1893 hipparionine horse
2001 collection
 Perissodactyla - Rhinocerotidae
Teleoceras sp.
Teleoceras sp. Hatcher 1894 rhinoceros
early 1970s collection